I saw those but am confused, I see salva 1,2,3,24,25,26,27,28,29,30,31. Why are there high numbers and where is 4-23? I've used 9 save slots, what would the 9th save be? The 9th one is the one I want to save.

That would be 29, I think. The saves are similar to Weekend in Capri. To be safe, you can make a folder and copy all of them in there with a sort of list and then overwrite these ones outside the made folder. I have 3 folders of saves that way.